Improvement in scroll-saws



s. ATK|NsoN.

Scroll-Saws. N0. 144,181. Patented Nov.4,1873.

` UNITED STATES ATENT I rrren. i

JOSEPH ATKINSON, OF BURLINGTON, NEV JERSEY.

IMPROVEMENT IN SCROLL-SAWS.

Specification forming part of Letters Patent No. 144,151, dated November 4, 1873; application filed March 15, 1873.

` in placing the sawarms in such a position that they will not pass below a horizontal line, which avoids a rounding cut of the wood operated upon; secondly, in the shortening and lengthening of the pitman-rod, by which the stroke of the saw is also lengthened and shortened, as coarse or .tine work may require; thirdly, in using on the upper arm a lever eccentric on the end, by aid of which the saw is more readily removed4 and placed in position, and also removed, while the other end of the saw is placed in a groove of the lower armhead, which is pierced with a number of holes to give the saw any desired movement, perpendicular or sloping, as may be desired. A set-screw is placed under the lower arm-head in such a position that it presses against the lower arm, and thus serves to give any desired tension to the saw; fourthly, in making the treadle adjustable, that it may be used either at the front or rear of the saw-bench, as desired.

In order to describe my invention more fully I refer to the accompanying drawing forming a part of this specification.

Figure I is a side elevation of a scroll-saw embodying my invention. Fig. II is a back view of the same. Fig. III is a detached enlarged view of the sawi'astener on the upper arm. Fig. IV is a detached enlarged view of the saw-fastener on the lower arm.

A is a frame, on which the table Bis placed. On the back end ofthe frame A are placed the two standards C, between which the two rock-shafts D D are placed, and vibrate on the set-screws d and b. To these rock-shafts are connected the two arms E E', which are held parallel to each other by aid of the curved arm F, pivoted to the said arms. The sawblade G is held between the ends of the sawarms E E', and is held to the upper arm by aid of a pin, c, passing through the end of the saw-blade and resting on the arms d cl on the slide c, which is held to the arm Ev by the. plates ff. To the upper end of the slide e is pivoted the eccentric g, to which the lever or arm h is connected. The saw-blade is placed in the groove K and held to the lower arm E by aid of the pin t', which is inserted in one oi' the holes in the fastening H. Said fastening' is held to the arm by aid of the screw or rivet Z. A set-screw, m, passing through the fastener and pressing against the arm, serves to` give the saw the required tension. I is the main shaft. J is a ily-wheel. K is a crank. L is an adjustable pitman between the crank and arm E'. By placing the crank-pin n in the holes o o made in the crank K, the stroke of the saw-blade A is lengthened and shortened. On the main shaft I is fastened a cogwheel, p, the cogs of which mesh into the cogs of the wheel M, pivoted to the standard N. A pitman, l), and lever It, pivoted to the con nection-rod S, serve to gives the machinery motion when a treadle is employed. T is a treadle, held to the rod S a-nd lever'R by aid of hooks t t on the treadle T, and s s on the arm WV. Said hooks' are placed over the pin e passing through the lever It.

Having thus described my invention, I desire to clann Holding and adjusting the saw-blade G by aid of the pin c, arms d d, slide e, plates ff, eccentric g, lever or arm h, pin i, fastener H, screw or rivet l, and set-screw m, in combination with the arms E E', substantially as and for the purpose set forth.

JOSEPH ATKINSON. Vitnesses H. MOFFETT, DANI.. P. NAYLOR.. 

